The successful harnessing of geothermal energy for the efficient heating and cooling of buildings relies upon the correct sizing of geothermal heat exchangers. This is done during the building’s design phase using extensive numerical simulations to forecast the unsteady thermal response of the geothermal heat exchanger and its surrounding ground for the next 25, 50, or even 100 years of operation. In the present work, an efficient numerical Laplace inversion formula is proposed, which applied to the obtained solution in the complex Laplace plane, allows the fast and accurate prediction of the sought unsteady thermal response.

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